Power Transformer MCQs Part 13

121. The secondary line voltage will be least for which of the following connections
a. delta-delta
b. wstar-star
c. delta star
d. star delta

122. The secondary line current will be least for which of the following connections
a. delta-delta
b. delta-delta
c. star-star
d. star-delta

123. What current in secondary will be flowing in each transformer
a. 303 A
b. 255 A
c. 203 A
d. 153 A

124. the load shared 400 KVA transformer will be
a. 234 kVA
b. 325 kVA
c. 456 kVA
d. 525 kVA

125. The load shared by 600 kVA transformer will be
a. 546 kVA
b. 456 kVA
c. 412 kVA
d. 388 kVA

126. Power factor of 400 KVA transformer will be
a. 0.882 lagging
b. 0.725 lagging
c. 0.625 lagging
d. 0.5 leading

127. Power factor of 600 KVA transformer will be
a. 0.882 lagging
b. 0.725 lagging
c. 0.625 leading
d. 0.182 leading

128. The core loss when the transformer is connected to 4400 Volt 50 Hz source will be
a. 306 W
b. 600 W
c. 904 W
d. 1004 W

129. The core loss when transformer is connected to 4600 volt 60 Hz source will be
a. 907 W
b. 875 W
c. 603 W
d. 306 W

130 Impedance matching transformers are used for
a. measuring low voltages and low currents
b. measuring high voltages and high currents
c. stabilising voltage fluctuations due to varying loads
d. minimizing the effects of harmonics

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